ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2015, Vol. 36 ›› Issue (5): 55-58.

• 组织和性能 • 上一篇    下一篇

Nb-Ti微合金化高性能桥梁钢Q370qE-HPS铸坯700~1050 ℃的热塑性

周雯1,吴开明1,王厚昕2,郭爱民2,邹德辉3,李书瑞3   

  1. 1. 武汉科技大学国际钢铁研究院,武汉 430081 ;
    2. 中信微合金化技术中心,北京 100004;
    3. 武汉钢铁(集团)公司研究院,武汉 430080;
  • 收稿日期:2015-05-06 出版日期:2015-10-01 发布日期:2022-08-16
  • 作者简介:周雯(1989-),女,硕士生(武汉科技大学),2013年武汉科技大学(本科)毕业,金属材料相变与组织控制研究。
  • 基金资助:
    CITIC-CBMM 铌钢研究与开发基金资助(2014- D078-1)

Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃

Zhou Wen1 , Wu Kaiming1 , Wang Houxin2 , Guo Aimin2 , Zou Dehui3 , Li Shurui3   

  1. 1. International Research Institute for Steel Technology, Wuhan University of Science and Technology, Wuhan 430081 ;
    2. Microalloying Technology Center, CITIC-CCMM, Beijing 100004;
    3. Research Institute, Wuhan Iron and Steel (Group) Corp, Wuhan 430080;
  • Received:2015-05-06 Published:2015-10-01 Online:2022-08-16

摘要: 利用Gleeble 1500D热模拟试验机,对开发的Q370qE-HPS高性能桥梁钢(/%:0.09C,0.36Si,1.33Mn,0.013P,0.004S,0.036Nb,0.015Ti,0.022Als,0.33CEV)230 mm×1 400 mm连铸坯进行700~1050℃的热塑性试验研究。结果表明,Q370qE-HPS高性能桥梁钢800~1050℃为高塑性区间,与传统正火工艺桥梁钢Q370qE(/%:0.14C,0.38Si,1.45Mn,0.012P,0.004S,0.028Nb,0.014Ti,0.023Als,0.38CEV)相比较,Q370qE-HPS钢高塑性的温度范围较大;700~800℃为低塑性区间,在此区间沿奥氏体晶界析出的铁素体膜使抗拉强度降低,尤其当晶界处存在Nb-Ti碳氮化物时,应力作用下容易产生裂纹和孔隙,从而使钢的热塑性降低。

关键词: Nb-Ti微合金化, Q370qE-HPS桥梁钢, 连铸坯, 正火Q370qE钢, 热塑性

Abstract: With using Gleeble-1500D thermal/mechanical simulation testing machine, the hot plasticity of 230 mm x 1400 mm casting slab of developed high performance steel Q370qE-HPS for bridge beam (/% : 0.09C, 0.36Si, 1.33Mn, 0.013P, 0.004S, 0.036Nb, 0.015Ti, 0.022Als, 0.33CEV) at 700-1050℃ has been tested and studied. Results show that the high hot plasticity zone of high performance steel Q370qE-HPS for bridge beam is at 800-1050℃,as compared with traditional normalized steel Q370qE for bridge beam (/% : 0.14C, 0.38Si, 1.45Mn, 0.012P, 0.004S, 0.028Nb, 0.014Ti, 0.023Als, 0.38CEV) the high plasticity zone of steel Q370qE-HPS is larger j and the low plasticity of steel is at 700-800℃ , in this zone the ferrite lath formed at austenite grain boundaries has low tensile strength especially as the Nb-Ti carbo-nitrides exist grain boundaries, the crack and void form easily by charging stress led to deteriorate the hot plasticity of steel.

Key words: Nb-Ti Microdloying, Steel Q370qE-HPS for Bridge Beam, Casting Slab, Normalized Steel Q370qE, Hot Plasticity